Moving her hands like Frisco, dances out alone on the canvas platform.

Meaning

Joe Frisco was a vaudeville performer, famous for his jazz dance routines and comedy. He wasn’t a graceful dancer, but he attracted attention because he was fun to watch.

Fitzgerald compares this girl to Frisco because the attention-grabbing style of Frisco is the style that famous performers of the time followed. There was an underlying desire for fame that embodied how these celebrities moved.